h1 { font-size: 1.5em; }

ul {
  position: absolute; top: 4em; padding: 0;
  list-style-type: none; width: 10em;
}

li {
  height: 2em; cursor: move;
  line-height: 2em; text-align: center;
  margin-bottom: 0.5em;
  border: 1px solid gray;
  background: #ff9;
}

ul.empty { height: 2em; border: 1px solid silver; background: #ddd; }

#paris { left: 2em; }

#world { left: 18em; }

#world li { background: #9f9; }
